Thursday, July 22, 2010

1910 ... outbreak of the pocket altimeter

this is a very useful altimeter ..... a Bourgeois - Engineering Chevallier .... Rue des Pyramides, Paris ....
1910 modelstreet level 0 is 770 mm of mercury per normal and go;the needle turns upside down? this is normal since altitude barometric pressure drop!you want to install:

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